The load must be distributed gradually on the cover so that it sits well on the seal. Do not start by tightening a screw to the bottom. Reassemble the cover by successively tightening the screws. In this case it should be changed at the same time as the impeller. Older water pumps sometimes close with a paper seal. The O-ring is replaced, greasing it to prevent it from drying out. To do this, check the direction of rotation, which is indicated on the pump cover. To prevent the vanes from twisting backwards on the first turn, they are predisposed in the correct direction when the impeller is installed. The wheel can be removed and reinstalled by simply aligning the key in the center.Ħ euros Pay attention to the direction of rotation indicated on the cover It was time to retrieve it before it went further into the engine.ĥ euros Put the new spinning wheel back in place In our case, the broken piece of the vane got stuck in the pump outlet pipe. When we started it up again, one of the vanes broke off. The impeller had stuck to the pump body during the winter. Once the pump is opened, we see the cause of our malfunction. Provide a small container to store them for the duration of the operation. Make sure that the screws do not fall into the bilge. Here on a Yanmar, the water pump is closed by 6 screws (flat head screwdriver).Ģ eurosRemove the screws and remove the cover Use the right tool to avoid damaging the screws. It is easy to locate, as it is connected to the water supply. The water pump is located on the front of the engine, often driven by a belt.
Step by step in pictures.įirst of all, before any operation on the water pump, you must close the water inlet valve! If you forget, you will soon realize it A small dismantling and replacement is necessary. Is there a problem with the water pump? Don't worry, it's probably the pump wheel that didn't stand the winter. But surprise, by throwing an eye on the exhaust we realize that the engine does not spit water as usual. Well winterized, the engine starts again without concern. It will help you to slide the impeller in place and will help it to turn freely once installed.That's it, the nice days are here. Make sure the key is replaced in the same orientation that it was removed. Most impellers that are mounted to a shaft are held in place by a small metal key.Try to mount the new impeller with vanes bent in the same direction Take note of which direction the impeller blades were bent on the original impeller.When installing the new impeller, there are a few things to watch for: Take care to flush the engine through to ensure that rubber bits aren’t blocking any cooling passages. If they aren’t visible, they may have made their way into the engine. If the impeller is cracked, or has pieces missing, try your best to find any missing pieces. There are many handy tools that can be used to extract a stuck impeller (in a pinch, a pair of screwdrivers tend to work well). When removing an impeller, space is sometimes limited. The forks pull on the back of the impeller as the screw is turned (pressing on the water pump shaft), forcing the impeller out. It if malfunctions, the engine will overheat.ĭepending on the type of engine, the impeller could be located in a few different places:Ī handy tool to remove an impeller. The impeller is the only device to provide the suction and pressure to move the water necessary for engine cooling. Additionally, if the water pump overheats, it will cause the impeller to break up into small bits.
Replacing impeller on inboard crack#
The impeller is pressed tightly into the water-pump housing and over time it loses its fit, and the rubber vanes can crack or degrade. It is spun by the engine and sucks in water to circulate through the engine.
It’s a small rubber device that looks like a paddlewheel. There aren’t many parts to the system and one necessary seasonal maintenance task is checking the impeller. Water gets sucked up from the water surrounding the boat, runs through the engine, and exits through the exhaust system. The marine engine’s cooling system is pretty basic. This is true for inboards, outboards and stern-drives. What he’s looking for is signs of water exiting with the exhaust: Water exiting means that it is being sucked up and pushed through the engine appropriately - this is the only visual clue that the raw-water cooling system is working. If you’ve spent any time in a boatyard during spring commissioning season, you won’t find it out of place to hear the roar of the engine and see a cloud of blue smoke erupt followed by a mechanic craning over the stern to look at the exhaust. A worn-out impeller is easily identified because the veins are bent.
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